Disk addition in RAID

Hi everyody,
I have a p-series server (9111-520)with AIX5.3 installed, having 2 disk mirrored for rootvg and 3 disk configured in RAID5 for datavg. Datavg is running out of space now just 512 MB space is available only. I want to add 3 more disk in existing array to extend the datavg, Is it possible?? Can anybody please tell me to add the disk without loosing data and is it possible to carry on disk addition without breaking RAID.
Thanks in Advance.
Regards
Jit

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As I know about IBM LVM there is no software RAID5, so your should be
hardware. To add disks to your RAID5 consult manual of RAID controller.
Usually there should be no problem to add disks w/o breaking RAID array